Friction shock-absorbing mechanism



KN iill|l.. ma MR K a N f A M m 11 Sept. 9, 1924.

. J. F. O'CONNOR FRICTION SHOCK ABSORBING MECHANISM Original Filed Sept. 8. 1921 Chicago,

. cially this specification.

Patented Sept. 9 1924.

JOHN F. O'CONNOR, OF CHICAGO,

W. H. MINER, INQ,

rumors, ASSIGNOR, BY mnsna a coaroaa'rzon or DELAWARE. 1

raic'rxon' snocx-nsonnme v MECHANISM.

Application-filed September 8,1921, Serial mf iaaao's. Renewed m 21, 1924. a J

To all whom; it may ao'mcem:

Be it known that I, JonN F. OCoNNon, a citizen of the United States, residin at in the county of Cook and tate of Illinois, have invented a certain new and useful Improvement in Friction Shock- Absorbing. Mechanisms, of which the followconcise and exact description, reference being had to the accompanying drawings, forming a part 0 This invention relates to improvements in 'friction shock absorbing mechanisms.

One object of the invention is to provide a friction shock absorbing mechanism espeadapted for railway draft rig 'ngs wherein are obtained high capacity an certain release, the friction-creating elements being of simple economical construction and few in number. A more specific object of the invention is to provide a mechanism of the character 1ndicated wherein two substantially independently functioning a railway draft rigging showing m sets of friction-creating elements, having different characteristics, are employed in substantially twin arrangement.

In the drawing forming a part of this specification, Figure 1 is a horizontal longitudinally extending section of a portion of 1mprovements in connection therewith. ig. 2 is a vertical transverse sectional view corresponding substantially to the line 2-2 of Fig. 1. And Figs. 3 and 4' are longitudinal sectional views of the shock absorbing mechanism proper, with parts broken away, corresponding to the diagonal section lines.

3-3 and 4-4 respectively, of Fig. 2.

In said drawing, 10'10 denote channel draft sills of a railway car to the inner faces ofv which are secured front stop lugs 11-11 and rear stop lugs 12-12. portion of a draw bar is indicated at 13 the same being operatively associated with the shock absorbin mechanism proper by a hooded cast yo e 14 and coupler key 15. The shock absorbing mechanism proper and a front follower 16 are disposed within the yoke and together with the latter are su ported in operative position by a detachab e saddle plate 17 p The shock absorbing mechanism proper,

as shown comprises, broadly, a combined friction s ell and spring cage casting A; a

' spring tion shoes E-E; and a. retainer boltF. j

assmnuamrs, 'ro

The casting A, as shown, is formediatfits. 2

front or outer end with a rectangularshell proper 18 having upper and lower walls 1919 and side wall 20-20, the same roviding interior longitudinally exten ing correspondingfiat friction surfacesl f P erably provided with interior corner fillets 21-21, as shown best in Fig. 2. The rear ortion of the casting A rovides the ca or the spring resistance The rear wa l of the casting A .is laterally extended and suitably reinforced so as to adapt it to function as therear follower of the mechanism. v

The wedge O is preferably in the formof a hollow casting, as shown, and is provided with four inwardly converging faces, thus producing a wedge of substantially pyramidal form. Two of said wedge faces, which are disposed diagonally opposite each other, as indicated at 22 in F1 3 extend at a relatively acute angle wi t blunt angle with respect to the axis of the.

Where f the walls 19 and 20 join, the shell is respect to the axis of' the mechamsm. On the remaining mechanism and forces applied substantially parallel thereto.

' The friction shoes D-D are arranged to cooperate with the wedge faces 22, each shoe D having a corresponding wedge face 122 as shown in Fig. 3. Similarly the shoes E are provided w1th wedge faces 123 cooperable with the wedge faces 23.

. The shoes D and E are symmetrically arranged with respect to the axis of the shell and in the corners of the latter so that each.

shoe D has two outer longitudinally extending friction surfaces extending substantially at right angles to each other and cooperable .with the inner friction surfaces of twowalls-19 and 20 of the shell. The wedge faces 22 and 122, 23 and 123 are arranged in planes perpendicular to coinciding with the diagonals of the shell as best shown by the section lines 3-3 and 4-4 of Fig. 2v so that, as pressure is exerted from the wedge to the shoes, the shell will tend to expand diagonall On account of the keener angles of t e faces 22 the planes and 122, the tendency to ex%a nd radially along the section lines 3-3 of 1g. 2' will be .greater thanalong the section line H.

jAll four friction-shoes D and E normally bear on the "spring resistance B so that, at the beginning of the compression stroke resistance is afiorded all shoes. It will be evident that the two shoes DD in conjunction with the wedge C may be considered as one system of friction elements having a keen angle wedge characteristic and that the other shoes 'lE-E in conjunction with the wedge C may be considered as a second system having a blunt angle wedge characteristic. Ubviously, the two said systems operate in the manner of a twin device but within the same friction shell. It will, furthermore, be noted that all of the wedge faces 22, 122, 23 and 123 are so located that they may be intersected by a single plane extending perpendicular to the axis of the mechanism. 1

In the operation of the device, during loud or draft, the front follower 16 and the shell A relatively approach each other, and the wedge C travels inwardly of the shell, while movement of the shoes D and E is resisted by the spring B. Due to the keen wedging angle between the Wedge O and the shoes D, and the relatively blunt wedging angle between the wedge O and movement of sai the shoes E, a wedging action is set up between the wedge and the shoes D, but there is no substantial wed ing action set u between the shoes ]E and the wedge O. hoes E and the wedge C move inwardly substantially as a unit, and as the shoes E will be advanced inwardlyof the shell to a sli htly greater extent than the shoes D, a slight spacing of the spring B with reference to the shoes D will result and the inward movement of the latter will no longer be opposed by the spring. The frictional resistance set up by the initial wedging action between the shell and the shoes D, being considerably greater than the resistance of the spring B, ofl'ers sufiicient 0 position to the inward d shoes to produce the de sired wedging action between shoes D and the wedge G. During the wedging action, the shell will expand along the diagonal section line 3-3.

During release, the tendency of the shell to contract produces inwardly directed lat eral pressure on the shoes, and the wedging faces thereof act reversely to the action previously described, the co-acting wedge faces of the shoes 1E and the wedge C being keen wedge actin with reference to the forces acting at rig t angles to the direction of the actuating forces during bufi and draft, whereby the wedge O is forced outwardly and the wedging pressure of the shoes D released, permitting the spring resistance B to restore all the parts to normal position.

I have herein shown and described what ll now consider the preferred manner of carrying out the invention, but the same is merely illustrative and l vcontemplate all cooperating inwardly conlverging "wedge faces extending at a difi'erent angle with respect to said axis.

2. In a friction shock absorbing mechanism, the combination with a friction shell; of a spring resistance; twosets of frictionshoes each comprising a plurality of shoes and all cooperable with said shell; and a wedge common to all of said shoes, said wedge and shoes of one set having wedge faces extending at one 'angle with respect to .the axis of the mechanism, said wedge and shoes of the/other set having cooperating wedge faces extending at a difi'erent angle with respect to said axis, all of said wedge faces converging in a common direction and being so located that a plane perpendicular to the axiswill intersect all of them.

3. In a friction shock absorbing mechanism, the combination with a friction shell; of a spring resistance; two sets of frictionshoes each comprising a plurality of shoes and all cooperable with said shell; and a wedge common to all of said shoes,,said wedge and shoes of one set having wedge faces extending at one angle with respect to the axis of the mechanism, saidwedge and shoes of the other set having cooperating wedge faces extending at a different angle with respect to said axis, all of said shoes at their inner ends bearing on theadjacent end of the spring resistance;

4. In a friction shock absorbing mechanism, the combination with a main follower;

of a friction shelld; a spring resistance" a nally extending interior friction surfaces;

. diagonally of a spring resistance; a wedge friction-shoe nism,

springresistance;

the combination with a substantiallyrectangular friction-shell having longitudi-' nally extending interior friction surfaces; of a 5 ring resistance; a wedge friction-shoe in eac corner of the friction-shell, one pair of opposite shoes having wedge faces extending at one angle with respect to the axis of the mechanism, the other diagonall opposite shoes havin wedge faces exten ing at a different ang c with respect to the axis of the mechanism; and a single wedge having faces corresponding-to the different wedge faces of the shoes and cooperablewith the latter.

7. In a friction shock absorbing mechanism, the combination with a friction-shell; of twin arranged sets of cooperable relatively keen and relatively blunt-angle wedgeface-friction-shoes and ressure-transmitting wedge means cooperab e therewith within the shell; and a spring resistance common to both sets of the friction-shoes for yieldingly resisting relative movement between the shell and the shoes. 1

8. In a friction shock absorbing mechanism, the combination with a friction shell having interior friction surfaces; of a spring resistance; a series of four friction shoes slidable within said shell and arran ed in a series; and a movable wedge acting etween said shoes, two of said shoes having inner faces disposed at a keen angle with reference to the axis of the mechanism and coacting with similarinclined faces of said wedge member, and the remaining shoes having inner faces disposed at a relatively blunt angle to said axis and coactin with similar y inclined faces on said we go member,

all of'said faces converging in a common direction.

9. In a. friction shock absorbing mechanism, the combination with a friction shell having interior friction surfaces; of a series of friction shoes within the shell cooperating with the friction surfaces thereof; a

spreader means cooperable with said shoes, said shoes and spreader means having a plurality of cooperating sets of faces converging in a common direction, two sets of which are disposed at relatively keen angles with reference to the longitudinal axis of the mechanism and the remaining sets of which are disposed at relatively blunt angles with reference to the axis of the mechanism.

10. In a friction shock absorbing mechanism, the combination with a friction shell having interior friction surfaces; of a spring of said shoes and said means having coopcrating sets of engaging faces inclined inwardly at a relativel acute and wedging angle with respect to orces applied substantially parallel to the axisof the shell, the remaining shoes and said means having cooperating sets of faces inclined inwardly to the axis of 11. In a friction shock absorbing mechanism, the combination with a friction shell the mechanism at a blunter angle.

havinginterior friction surfaces; of an even number of friction shoes cooperable with said shell and arranged in series; a spring resistance; and spreader means cooperable with said shoes, said shoes and spreader means having a plurality of cooperating sets of faces, part of which are arranged at a relatively keen wedge acting angle and others of which are arranged at a relatively blunt releasing angle, certain of said blunt and keen shoes being disposed adjacent each other.

- In witness that I claim the foregoing I have hereunto subscribed my name this 27th day of Aug. 1921. I

JOHN F. OOONNOR. Witnesses:

CARRIE GAILING, UNA C. Pnnm. 

